Close the gaps left after the #344 and #359–#387 batch

[LeadcodeDev]

Tracking issue for the gaps left after #344 and #359–#387 were closed.

Every closed issue was re-verified against main (0.7.1, ef0b69e) by re-running its reproductions and rendering its requested features. Several fixes do not reach the render, some sub-requests were never delivered, and a user who built a real one-take product film with 0.7.0 reported further blockers. Each sub-issue below is self-contained: context, items with reproductions, known root causes and a definition of done.

Suggested order

1. Regression: no icon renders since the icon cache rework (#365) #425 — regression: no icon renders (blocks every scenario using icon).
2. Animations touching only border_radius, clip_path_progress or font_size are never applied #426 — animations touching only border_radius, clip_path_progress or font_size are dropped (one root cause behind Animating border_radius validates and has no effect #373, Animate clip-path: interpolate polygon, inset, circle and ellipse in keyframes #384 and a user report).
3. Camera: a world larger than the frame, per-segment easing, handheld shake, camera-aware validation #428 and Motion blur: pointer paths, in-flow ghost placement, velocity-oriented smear, smooth whip, camera motion blur #427 — free camera and motion blur: the user's main blockers.
4. Text: letter_spacing on rich_text/gradient_text, animated tracking layout, static opacity vs animated opacity, caret after typed text #430, char_* presets: rotate_from, scale/baseline jitter, reflow (undelivered parts of #363) #429, Path drawing: draw_start on finished svg strokes, arrow/connector, draw_offset, svg d morph, dot at progress 0 #431, Transitions: feathered wipes leak at fixed edges, clip-path blob, iris pill, warnings for ignored fields #432, Pointer: waypoints without a click, readable hand/grab glyphs #433, Materials, 3D and backgrounds: inflated banding, globe arcs over time, layout-surface orientation, halo interpolation, box-shadow under transparent boxes #434, Validator and vocabulary consistency: arrow/connector bounds, overflow hints, gradient stops, duplicate warnings #437.
5. Documentation errors found while verifying the latest features #436 — documentation, then Encoding default and release: 8-bit H.264 by default, publish main #435 — encoding default and release.

Sub-issues

• Regression: no icon renders since the icon cache rework (#365) #425 Regression: no icon renders since the icon cache rework (Icons: cache keyed by colour and size, no retry on HTTP 429, and render panics where still and sheet only warn #365) — merged in fix(icons): repair the attribute rewrite that stopped every icon rendering #439
• Animations touching only border_radius, clip_path_progress or font_size are never applied #426 Animations touching only border_radius, clip_path_progress or font_size are never applied — merged in fix(animation): make every animated property reach layout and the frame #443
• Motion blur: pointer paths, in-flow ghost placement, velocity-oriented smear, smooth whip, camera motion blur #427 Motion blur: pointer paths, in-flow ghost placement, velocity-oriented smear, smooth whip, camera motion blur
• Camera: a world larger than the frame, per-segment easing, handheld shake, camera-aware validation #428 Camera: a world larger than the frame, per-segment easing, handheld shake, camera-aware validation
• char_* presets: rotate_from, scale/baseline jitter, reflow (undelivered parts of #363) #429 char_* presets: rotate_from, scale/baseline jitter, reflow (undelivered parts of char_* presets are silently ignored on rich_text and gradient_text, and lack rotation, per-unit jitter and reflow #363) — merged in feat(char): add rotate_from, scale and baseline jitter, and reflow #450, closed after both stated gaps were resolved
• Text: letter_spacing on rich_text/gradient_text, animated tracking layout, static opacity vs animated opacity, caret after typed text #430 Text: letter_spacing on rich_text/gradient_text, animated tracking layout, static opacity vs animated opacity, caret after typed text — merged in fix(animation): make every animated property reach layout and the frame #443
• Path drawing: draw_start on finished svg strokes, arrow/connector, draw_offset, svg d morph, dot at progress 0 #431 Path drawing: draw_start on finished svg strokes, arrow/connector, draw_offset, svg d morph, dot at progress 0 — merged in fix(draw): make draw_start, draw_offset and svg path morph reach the frame #444
• Transitions: feathered wipes leak at fixed edges, clip-path blob, iris pill, warnings for ignored fields #432 Transitions: feathered wipes leak at fixed edges, clip-path blob, iris pill, warnings for ignored fields — merged in fix(transition): stop the feather leaking, give the pill its corners, add clip-path blob #448
• Pointer: waypoints without a click, readable hand/grab glyphs #433 Pointer: waypoints without a click, readable hand/grab glyphs — merged in fix(pointer): add per-waypoint click, redraw the hand and fist, make outline visible #442
• Materials, 3D and backgrounds: inflated banding, globe arcs over time, layout-surface orientation, halo interpolation, box-shadow under transparent boxes #434 Materials, 3D and backgrounds: inflated banding, globe arcs over time, layout-surface orientation, halo interpolation, box-shadow under transparent boxes — merged in fix(paint): dither the inflated ramp, face the surface, wire the halo lerp #445
• [~] Encoding default and release: 8-bit H.264 by default, publish main #435 Encoding default and release — item 1 merged in fix(encode): make 8-bit the default H.264 output #441; 0.8.0 is prepared and its publish dry-run is green, awaiting the tag
• Documentation errors found while verifying the latest features #436 Documentation errors found while verifying the latest features — merged in docs(skills): fix the broken examples and add the check that keeps them fixed #446
• Validator and vocabulary consistency: arrow/connector bounds, overflow hints, gradient stops, duplicate warnings #437 Validator and vocabulary consistency: arrow/connector bounds, overflow hints, gradient stops, duplicate warnings — merged in fix(validate): stop the false positives, name the right edge, warn once #449

Out of scope for now (to discuss)

• Sound effects generated from events (clicks, keystrokes): a synthesised score already exists.
• Free per-frame computed animation (springs, arcs, grouping): expressions and node() cover part of it.

Rules for every sub-issue

• Test first: a test that fails on main, a render test with pixel assertions for anything visual.
• Verified end to end (scenario, validate, render, image inspected) before the PR is merged.
• Docs, rules and schema updated with any vocabulary change; a field the validator accepts must have an effect.
• One PR per sub-issue. No AI attribution in commits, PRs or comments.

[LeadcodeDev]

#425 is merged (#439). The attribute rewrite left width="84"" behind, so no icon has parsed since #390; the existing tests asserted contains("width=\"84\""), which is true of the broken string too. Render tests with pixel assertions now cover it — 0 coloured pixels on the revert. render --frame also exits 1 on an unresolvable icon like the other paths, and a cache filled under the old {slug}-{colour}-{w}x{h} naming is migrated rather than refetched.

Its fourth item — an offline gate for icons — is #440 rather than part of that PR: #320 has since landed --allow-remote-fonts, and the icon gate should follow that decision rather than precede it.